var banner = new Array();

banner.push('http://img97.imageshack.us/img97/7081/bannireoe.jpg');
banner.push('http://img412.imageshack.us/img412/1308/bannire2s.jpg');
banner.push('http://img840.imageshack.us/img840/9746/bannire3r.jpg');
banner.push('http://img836.imageshack.us/img836/2136/bannire4.jpg');
banner.push('http://img207.imageshack.us/img207/4624/bannire5.jpg');

document.getElementById('i_logo').src= banner[Math.floor(Math.random()*banner.length)];